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Answers to key questions on link between drilling industry's injection wells and earthquakes
Reported by: Associated Press
Reported: Monday, July 14, 2014 5:16 PM EDT
FORT WORTH, Texas
States where hydraulic fracturing is taking place are experiencing unprecedented earthquake activity.
Scientists are researching whether these injections are causing quakes.
A study published earlier this month in the journal Science suggests that just four injection wells in Oklahoma have caused about 20 percent of the quakes from the eastern border of Colorado to the Atlantic coast since 2008.
However, seismologists and the oil and gas industry stress that the number of earthquakes tied to injection wells is small relative to the thousands of wells in operation in recent decades.